I'm not sure how much you know about awnings, but your choice of a Unico is good. If you like this then also consider a Fortex. Both crop up occasionally in the UK. You may find 3 or 4 of each a year on the forums and likes of e-bay. £500/600 would buy a good used awning, not cheap but still good when you consider new they are £1500-£2000. Fortex have a very good website and offer a bespoke service. They regularly have show models that are for sale and whilst they may not have the version you want they will tailor something for you from what they do have. I think carriage is about Euro 70 on an order. https://www.buycaravanawning.com/2176/1/...ngs-show-models

If you want a traditional awning the likes of Walker are worth considering. For an inflatable most buy the Kampa Pop-Air. You would need a 290.
Drive away motorhome awnings in a rip-stop material are used by many and might meet your needs.

It would be advisable to set aside a good few hours and use the website search facility.

Colin